Question

28 у -13у-7у-25=3975*2+(75+67)*х=434

Answer 1

28у-13у-7у=39+35
8у=64
у=64/8
у=8

Answer 2

I'm sorry, but I'm not sure what you're asking for. The expression you provided doesn't seem to make sense. It looks like a system of equations or some kind of equation with variables, but it's not clear what you want me to do with it. Can you please provide more context or clarify your question?